a BALL A1 PAD CORNER 324-Ball Plastic Ball Grid Array [PBGA] (B-324) Dimensions shown in millimeters A1 CORNER INDEX AREA 19.20 19.00 SQ 18.80 18 16 14 12 10 8 6 4 2 17 15 13 11 9 7 5 3 1 A B C D E F G H J K L M N P R T U V 1.00 BSC TOP VIEW BOTTOM VIEW DETAIL A DETAIL A 3.00 0.25 0.30 MIN SEATING PLANE 0.70 0.60 0.50 BALL DIAMETER COMPLIANT TO JEDEC STANDARDS MS-034-AAG-1 2.50 MAX COPLANARITY 0.20 MAX 012306-0 3.50 MAX